The new M4+v3 DSP amplifier can be considered as the little brother of the M6 model. The only difference: The M4+ is coming with four amplified speakers, but still offering more power per channel than the larger M6. The newly engineered Class D technology is particularly immune to EMC interference, which is virtually indispensable in today‘s electronic-packed vehicles.

A key-premise to enjoy interference-free music while driving. With four bridged power outputs, each one providing 135 watts RMS per channel (2 Ω), the M4+v3 offers remarkable output power with a total of 540 watts RMS. M4 + is perfect for tuning original 4-channel sound systems. Four additional DSP-tunable preamp outputs allow the integration of further amplifiers.

Test Review

Intelligent High Level Input (Error Protection System)

Start-Stop ready, Auto Turn-On

Burr-Brown converters (PCM3168A) and Analog Devices DSP (ADAU1452)

32bit, 295 MHz DSP technology, controllable via new V3 PC software or Tunest App

Soft-Clipping (power attenuation) in 2 Ohm operation

Signal-to-noise Ratio ≥90dB

Frequency Response 15 Hz – 22 kHz (-3dB)

THD ≤0.1% (1 kHz, 4Ω, 90% Power)

Separately controllable input sensitivity (Channel 1-6, AUX), Clipping LEDs

Plug+Play with vehicle-specific cable sets

External Bluetooth® USB-Dongles BTS, BTS-HD & BTA2 for Audio Streaming & App Control (optional)

Digital remote control DRC1 with OLED display for controlling various DSP functions (optional)


EPS technology which prevents when connected to an OEM factory radio that nofunctions are impaired or error messages are written into the vehicle memory.

6 -fold laminated board effectively suppresses EMC interference due to the favorable topology.

Bridging amplifier channels enables more flexibility to handle the power.


Power output(RMS) @ 13.8 VDC, 1% THD:

4 x 100/135 Watts RMS @ 4/2 Ω or

2 x 270 Watts RMS @ 4 Ω bridged

6 x High Level Input

6 x RCA Low Level Input*

2 x AUX/RCA Input, 1 x Optical Input/Stereo

4 x Loudspeaker Output amplified

4 x Pre-Amplifier Output/RCA (configurable via DSP)

Dimensions: 220 x 44 x 150 mm

* only with optional MPK-RCA6/MPK-RCA6-PP cable se